Zirconium oxide uye aluminum oxide zvakasanganiswa zvinopa Zirconia Toughened Alumina (ZTA), chinhu chakasarudzika mumashandisirwo mazhinji. Mechanical properties, simba, kutyoka kuoma, elasticity, kuomarara uye kupfeka kuramba kunoyemurwa zvakanyanya mune ino yakaumbwa zvinhu zveceramic izvo zviri zvekirasi yeAZ anoumbwa.. ZTA yave sarudzo inosarudzika kune yakakwira mechanika simba, Thermal resistance uye corrosion resistance.
Decoding Kuumbwa uye Chimiro
Pakati pezvimwe zvinhu, Zirconia Toughened Alumina ine zirconia zviyo zvakaparadzirwa zvakafanana mukati me alumina matrix.. Kazhinji, izvi zvinosanganisira 10-20% vhoriyamu yeZrO2 mune alumina. Zvichienderana nehuwandu hwavo, constituent musanganiswa inobatsira kune ceramics ine chaiwo maficha zvichienderana neamwe application.
Zvivharo zvekuvaka: Alumina uye Zirconia
Izvo zvakakosha zvinosanganiswa kuita ZTA ndeye alumina uye zirconia. Uyezve, orthopedic implants vanga vachishandisa iyi ceramic material inozivikanwa seAluminium Oxide (Al2O3) munhoroondo nekuda kwekunaka kwayo biocompatibility pamwe nekusimba kwayo kukuru kwemuchina uye kuramba kwekutyoka.
Chimwe chinhu chakatanhamara che zirconia mazinga ayo akaderera ekuora pamwe nekugadzikana kwakanaka kwekemikari uye kusimba kwemagetsi.. Yayo Yechidiki modulus iri mune imwechete kurongeka kwehukuru nesimbi isina tsvina alloys.
Magadzirirwo Azvinoitwa
Kugadzira ZTA zvinoreva kugadzira tetragonal-phase zirconia zviyo zvakagoverwa zvakafanana mukati mealumina matrix.. A crack tip stress concentration inogona kushandura tetragonal crystal structure kuita monoclinic imwe zvoita kuti iwedzere kuwedzera kwehuwandu hwe zirconia.. Kuwedzera kwevhoriyamu kwakadaro kunodzosera kumashure kana kumisa kukura kwecrack zvichitungamira mukuoma uye kusimba kukuru.
Mechanical Properties yeZrO2-Al2O3 Ceramics
Kune huwandu hwakasiyana hwemakanika zvivakwa zvinoratidzwa neZTA zvinosanganisira kuomarara kwepamusoro pane akajairwa maalumina ane akafanana density values., yakakwirira kuchinjika simba kupfuura akajairwa aluminas uye yakaderera pane yakajairwa zirconias coefficient ye linear thermal expansions. (CLTE).
Zirconia Toughened Alumina ine simba remuchina uye inodzivirira kupisa nekudaro haiparare.. Pazasi pane zvimwe zveZTA zvivakwa:
Property Value
Chemical Formula Zr-Al2O3
Density 4.1-4.38 g/cm^3
Kuoma 1750-2100 Bhatani
Elasticity 45-49 x 10^6 psi
Flexure Strength 100-145 ksi
Chiyero chePoisson 0.26
Kuputsika Kuoma 5-7 MPa m^1/2
Coefficient of Thermal Expansion 8.0-8.1 x 10^-6 1/C
Thermal Conductivity 20.0-21.0 W/mK
Shock Resistance 325 °C
Maximum Working Temperature 1650 °C
Zvishandiso zveZrO2-Al2O3 Ceramics
Zirconia Toughened Alumina inoshandiswa mumashandisirwo akasiyana siyana seaya anoda simba rakakura uye kuramba kupfeka. Izvi zvinosanganisira zvisimbiso zvevharuvhu, maoko, pombi pistons, kupfapfaidza nozzles nezvimwe zvikamu zveindasitiri.
Biocompatibility yeZTA
Muzvidzidzo zvakasiyana, ZTA inonzi haiburitse maitiro akashata pakusimwa nekudaro zvichiita kuti ive mumiriri akanaka wemapfupa anotakura zvinhu zvinotakura zvinhu.. Pamusoro pe, kuoma, kusimba uye kusimba kunoratidzwa ne zirconia-alumina ceramics inoita kuti ikwane kune orthopedic inotakura zvinhu zvinotakura..
ZTA muHip Arthroplasty
Pakave nenhaurirano dzakakura pamakeramiki senge alumina, zirconia uye zirconia yakaoma alumina (ZTA) sezvinhu zvakakodzera muhudyu arthroplasty . Aya mabhenefiti eZTA akawanikwa pasina kufanira kubatanidza zvisungo zvine chekuita neyttria-yakadzikama zirconia inoratidza yakakwira michina zvivakwa kana alumina nekusagadzikana kwayo kwakanyanya..
ZTA muKnee Arthroplasty
Zvikuru, ceramic implant madhizaini eiyo yakazara ibvi arthroplasty (TKA) yakagadziridzwa kuitira kubata nyaya yekusagadzikana kweallergies inogona kuitika muvarwere kana yemazuva ano titanium kana cobalt-chromium alloy components inoburitsa kupfeka zvimedu.. The Zirconia Toughened Alumina (ZTA) Matrix Composite ndeye yekucheka kumucheto biomaterial kune akadaro maapplication.
ZTA: Ramangwana Rakavimbiswa
Izvi zvinosanganisira kuenderera mberi kwekutsvaga pamwe nekuvandudza nzira dzekuvandudza hunhu hweZTA uye mashandisiro ayo anogona kuita. Imwe batch-yakagadziriswa Zirconia Toughened Alumina yakagadzirwa nemagetsi zvimiro maererano nekushanduka kwesimba rakaderera pane iro rinowanikwa mune zvekutengesa Biolox® Delta.. Imwe, sesilicon nitride ceramics composites yakaunzwa munguva pfupi yapfuura muhudyu arthroplasty inoratidzawo simba rakakwirira kudarika alumina.Ramangwana rakajeka kuZTA rine maapplication akawanda uye zvemhando yepamusoro.. Naizvozvo, ine tekinoroji inoshanduka, zvinotarisirwa kuti ZTA ichave hwaro hwepfungwa nyowani pamativi akasiyana siyana kunyanya pabiomedicine.